guitar pick vs plectrum

guitar pick and plectrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
guitar pick	Yes	No	No	No
plectrum	Yes	No	No	No

As nouns, plectrum is a hypernym of guitar pick; that is, plectrum is a word with a broader meaning than guitar pick:

guitar pick: a plectrum used to pluck a guitar
plectrum: a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument

Other hypernyms of guitar pick include pick, plectron.

guitar pick (noun)	plectrum (noun)
a plectrum used to pluck a guitar	a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument